President Trump wiped out more Obama-era regulations Monday, signing four bills that cancelled rules on federal contracts, land use and education that he said killed jobs.

Mr. Trump relished signing the deregulation orders that were passed under the rarely-used Congressional Review Act that fast-tracks disapproval of regulations.

“Only one time in our history did a president sign a bill to cancel federal regulations,” said Mr. Trump, who so far has done it seven times.

He promise that he would keep using it “to remove every job-killing regulation we can find.”

The first bill he signed rolled back the “Fair Pay and Safe Workplaces” rule, also known as the “blacklisting” rule, that barred federal contracts to companies with a record of breaking wage, labor or safety laws.

The president called the rule “a disaster” and “one of the greatest threats to growing American businesses.”

At the signing ceremony in the Roosevelt Room, Mr. Trump was surrounded by governors and Congress members whose states stood to benefit form the deregulation.